Cementitious binders from activated stainless steel refining slag and the effect of alkali solutions

Salman, Muhammad; Çizer, Özlem; Pontikes, Yiannis; Snellings, Ruben; Vandewalle, Lucie; Blanpain, Bart; Balen, Koen Van

doi:10.1016/j.jhazmat.2014.12.046

Cited by 80 publications

(42 citation statements)

References 32 publications

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“…Additionally, the stability of calcium-containing precipitates also depends upon the medium composition and pH , which render it difficult to define a general kinetic reaction model and to predict the effects of calcium-rich admixtures in specific mix designs. Nonetheless, Salman et al (2015) observed very early exothermic peaks during the alkali activation of Ca-rich slags, from which the authors concluded that they must be related to the enhancement of reaction kinetics due to the hydrolysis of Si-O-Ca and Ca-O-Ca linkages.…”

Section: Introductionmentioning

confidence: 99%

Increasing the Dimensional Stability of Cao-Feox-Al2o3-Sio2 Alkali-Activated Materials: On the Swelling Potential of Calcium Oxide-Rich Admixtures

Ascensão¹,

Marchi²,

Segata³

et al. 2019

Detritus

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Advanced thermochemical conversion processes are emerging technologies for materials' recovery and energetic conversion of wastes. During these processes, a (semi-)vitreous material is also produced, and as these technologies get closer to maturity and full-scale implementation, significant volumes of these secondary outputs are expected to be generated. The production of building materials through the alkali activation of such residues is often identified as a possible large-scale valorization route, but the high susceptibility of alkaliactivated materials (AAM) to shrinkage limits their attractiveness to the construction sector. Aiming to mitigate such a phenomenon, an experimental study was conducted investigating the effect of calcium oxide-rich admixtures on the dimensional stability of CaO-FeO x -Al 2 O 3 -SiO 2 AAMs. This work describes the impacts of such admixtures on autogenous and drying shrinkage, porosity, microstructure, and mineralogy on AAMs. Drying shrinkage was identified as the governing mechanism affecting AAM volumetric stability, whereas autogenous shrinkage was less significant. The reference pastes presented the highest drying shrinkage, while increasing the dosage of shrinkage reducing agent (SRA) was found to reduce drying shrinkage up to 63%. The reduction of drying shrinkage was proportional to SRA content; however, elevated dosages of such admixture were found to be detrimental for AAM microstructure. On the other hand, small dosages of calcium oxide-rich admixtures did not induce significant changes in the samples' mineralogical evolution but promoted the formation of denser and less fractured microstructures. The results presented here show that calcium oxide-rich admixtures can be used to increase AAM's volumetric stability and an optimal dosage is prescribed.

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Section: Introductionmentioning

confidence: 99%

Increasing the Dimensional Stability of Cao-Feox-Al2o3-Sio2 Alkali-Activated Materials: On the Swelling Potential of Calcium Oxide-Rich Admixtures

Ascensão¹,

Marchi²,

Segata³

et al. 2019

Detritus

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“…Numerous ways of activation are reported in the literature, most of them rely on alkali activation [8,9]. Salman et al [27] studied the effect of Na-silicate, KOH and NaOH activation of steel slag mortar. They achieved substantial rate of improvement of early age compressive strength (after 3 days of steam curing) with Na-silicate-NaOH compared to K-silicate-KOH activation.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of high energy over conventional milling of granulated blast furnace slag powder to improve mechanical performance of slag cement paste

Bouaziz

Hamzaoui²,

Guessasma

et al. 2017

Powder Technology

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This work aims at bridging the efficiency of ball milling of granulated blast furnace slag (GBFS) to the structural and mechanical properties of slag cement pastes. Both conventional and high energy milling of GBFS are considered with a milling duration varied between 1 and 10 h. X-ray diffraction, infra-red spectroscopy, granulometry analysis and scanning electron microscopy are used to draw the main lines of structural and Morphological changes occurring during milling. Cement pastes formulated using 45% of GBFS in substitution are Characterized. Workability, X-ray diffraction analysis, differential scanning calorimetry and compressive testing ate performed to analyse main structural changes and reactions driven by the presence of milled GBFS as well as its direct consequence on the mechanical strength of slag cement pastes. Slag milling indicates the superior efficiency of high-energy milling, which allows a maximum slag finesse of 1.79 m(2)/g after 3 h of milling. Major structural changes occur during the first 3 h of high energy milling while conventional milling does not induce any remarkable trend. These changes concern amorphisation of the bulk structure in addition to the fracturing and agglomeration of slag particles. Workability of slag cement pastes is remarkably improved when using 1 h of high-energy slag milling. This result is consistent with slag finesse trend with respect to milling time and with the improvement of GBFS reactivity. The substitution of 45% of cement (CEM I 52.5) by GBFS is only beneficial at the condition of performing high-energy milling for at least 1 h

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“…Many kinds of different slag are formed in the production of steel from scrap metal during the different level of metal processing. The slags is formed in the final stage of the metallurgical process naturally and functioned as a covering layer for the molten metal to avoid from oxidation and also functioned to minimized heat loss [17]. Slag has a high content of silica and alumina with a high composition of calcium.…”

Section: Blast Furnace Slagmentioning

confidence: 99%

Evaluarea liantilor geopolimerici activati alcalin ca alternativa la cimentul Portland

Faris¹,

Abdullah²,

Sandu³

et al. 2017

Mat.Plast.

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This study summarizes the recent achievements in the development of alternative cement free binder materials (cementless) called alkali activated binder or more popularly known as geopolymers. The history of the development of alkali activated binder and recent terminology are discussed. The influence of the type of the base materials on the properties of goepolymers are thoroughly reviewed. The effect of composition and concentration of alkali and curing temperature on the properties and mechanical behavior of the resulting alkali activated material are discussed. Different type of base materials used in the formation of alkali activated material are blast furnace slag, metakaolin, fly ash, bottom ash, volcanic ashes, and red mud. The state-of-the art in this field demonstrated that this type of materials are ecologically friendly alternative of the Ordinary Portland cement.

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Cementitious binders from activated stainless steel refining slag and the effect of alkali solutions

Cited by 80 publications

References 32 publications

Increasing the Dimensional Stability of Cao-Feox-Al2o3-Sio2 Alkali-Activated Materials: On the Swelling Potential of Calcium Oxide-Rich Admixtures

Increasing the Dimensional Stability of Cao-Feox-Al2o3-Sio2 Alkali-Activated Materials: On the Swelling Potential of Calcium Oxide-Rich Admixtures

Efficiency of high energy over conventional milling of granulated blast furnace slag powder to improve mechanical performance of slag cement paste

Evaluarea liantilor geopolimerici activati alcalin ca alternativa la cimentul Portland

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